Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 5 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/11/2021   22:01:38   (  -0.06,-128.01) (  -0.36,-129.51)  170.30                80
 05/12/2021   21:45:33   (  -0.05,-128.04) (   0.61,-124.98)  349.18                80
 05/14/2021   10:07:22   (   0.06,-128.14) (   0.54,-130.25)  240.81                80
 05/15/2021   09:45:59   (   0.05,-128.17) (  -0.49,-125.73)  277.62                80
 05/16/2021   22:07:56   (  -0.06,-128.14) (  -0.72,-131.03)  329.87                80
 05/17/2021   21:51:53   (  -0.06,-128.17) (   0.32,-126.51)  188.90                80
 05/19/2021   10:13:42   (   0.06,-128.26) (   0.83,-131.79)  401.10                80
 05/20/2021   09:52:18   (   0.06,-128.28) (  -0.15,-127.25)  116.89                80
 05/21/2021   22:14:15   (  -0.07,-128.24) (  -1.05,-132.56)  492.30                80
 05/22/2021   21:58:11   (  -0.06,-128.26) (  -0.02,-128.03)   25.90                80